CVE-2020-11934

Name	CVE-2020-11934
Description	It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
snapd (PTS)	stretch (security)	2.21-2+deb9u1	fixed
	stretch (lts), stretch	2.21-2+deb9u3	fixed
	buster (security), buster, buster (lts)	2.37.4-1+deb10u3	vulnerable
	bullseye (security), bullseye	2.49-1+deb11u2	fixed
	bookworm	2.57.6-1	fixed
	trixie	2.65.3-1	fixed
	sid	2.66.1-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
snapd	source	stretch	(not affected)
snapd	source	(unstable)	2.45.2-1

Notes

[buster] - snapd <no-dsa> (Minor issue)
[stretch] - snapd <not-affected> (Vulnerable code not present)
https://github.com/snapcore/snapd/commit/06342a31878f1cf99d56da5483e71b9af61f46ad